diff --git a/makefile b/makefile
index 28eb98f..ca2de49 100644
--- a/makefile
+++ b/makefile
@@ -25,7 +25,7 @@ FLAGS += -Wdisabled-optimization
 FLAGS += -fanalyzer
 # These flags are because of the compiler otherwise giving too much warning
 FLAGS += -Wno-sign-conversion
-#FLAGS += -Wformat-truncation=0
+FLAGS += -Wformat-truncation=0
 
 # Compile flag for defining GITHASH to put at the end of the version string
 GITFLAG = -D'GITHASH=$(shell git rev-parse --short=1 HEAD)'
@@ -37,6 +37,7 @@ OUTDIR = out
 # The UI to compile for by default using make run
 #UI_TARGET = vt100
 UI_TARGET = ncurses
+UI_TESTING = stub
 
 # The URL of the plaintext version of the lisence, for the --license option
 LICENSEURL = https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
@@ -44,6 +45,10 @@ LICENSEURL = https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
 # C compiler
 CC = cc
 
+# Test options
+TEST_COLUMNS = 1000
+TEST_ROWS = 30
+
 .NOTINTERMEDIATE:
 
 # Messages to print during different steps in making
@@ -65,6 +70,22 @@ run: $(OUTDIR)/connect4_$(UI_TARGET).elf
 run_%: $(OUTDIR)/connect4_%.elf
 	./$<
 
+# Show result of test
+test: test.diff
+
+# Diff between the tests
+test.diff: test.log test.log.slow
+	diff -y $^ > $@ || tail $@
+	diff -q $^
+
+# Log of testing fast logic
+test.log: $(OUTDIR)/connect4_$(UI_TESTING).elf
+	./$< -o $@ -c $(TEST_COLUMNS) -r $(TEST_ROWS) --random-moves
+
+# Log of testing slow logic
+test.log.slow: $(OUTDIR)/connect4_$(UI_TESTING).elf
+	./$< -o $@ -c $(TEST_COLUMNS) -r $(TEST_ROWS) --random-moves --slow-calcWins
+
 # Compile specifically the ncurses version
 # This one's special because it needs -lncursesw
 $(OUTDIR)/connect4_ncurses.elf: $(addprefix $(OBJDIR)/,ui_ncurses.o logic.o connect4.o LICENSE.o)